Helmet cover



FIG. 1 is a front elevational view of a helmet cover showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top elevational view thereof;

FIG. 5 is a bottom elevational view thereof; and,

FIG. 6 is a bottom perspective view thereof. 

CLAIM The ornamental design for a helmet cover, as shown and described. 